1. An electronic feedback system comprising:
a first feedback loop for controlling a first operating parameter of the feedback system; and
a second feedback loop including a plurality of digital control signals to influence the feedback system in a manner which, absent the first feedback loop, would result in a change to the controlled first operating parameter when one or more of the digital control signals change value;
wherein the second feedback loop is configured to affect a larger controlled range of the controlled first operating parameter than the first feedback loop is configured to affect; and
wherein the second feedback loop is arranged to influence the feedback system slowly enough, relative to the first feedback loop, to allow the first feedback loop to maintain the controlled first operating parameter without significant perturbation.
2. The system as recited in claim 1, wherein:
the electronic feedback system comprises a phase locked loop; and
the controlled first operating parameter comprises a phase or phasefrequency error of the phase locked loop.
3. The system as recited in claim 1 wherein:
the first feedback ioop is responsive to a second operating parameter for controlling the first operating parameter; and
the second feedback ioop is also responsive to the second operating parameter.
4. The system as recited in claim 3 wherein:
the second operating parameter comprises a control node voltage.
5. The system as recited in claim 1 wherein:
the electronic feedback system comprises a phase locked loop having a controlled oscillator; and
the controlled first operating parameter comprises an operating frequency of the controlled oscillator.
6. The system as recited in claim 1 wherein:
the controlled first operating parameter comprises an effective impedance between two circuit nodes.
7. A method for controlling an electronic feedback system, said method comprising:
controlling a first operating parameter of the feedback system using a first feedback loop; and
controlling a plurality of digital control signals of a second feedback loop to influence the feedback system in a manner which, absent the first feedback loop, would result in a change to the controlled first operating parameter when one or more of the digital control signals change value, but said second feedback loop influencing the feedback system slowly enough relative to the first feedback loop, to allow the first feedback loop to maintain the controlled first operating parameter without significant perturbation;
wherein the second feedback loop is configured to affect a larger controlled range of the controlled first operating parameter than the first feedback loop is configured to affect.
8. The method as recited in claim 7 wherein:
the electronic feedback system comprises a phase locked loop; and
the controlled first operating parameter comprises a phase or phasefrequency error of the phase locked loop.
9. The method as recited in claim 7 wherein:
the first feedback loop is responsive to a second operating parameter for controlling the first operating parameter; and
the second feedback loop is also responsive to the second operating parameter.
10. The method as recited in claim 9 wherein:
the second operating parameter comprises a control node voltage.
11. The method as recited in claim 7 wherein:
the electronic feedback system comprises a phase locked loop having a controlled oscillator; and
the controlled first operating parameter comprises an operating frequency of the controlled oscillator.
12. The method as recited in claim 7 wherein:
the controlled first operating parameter comprises an effective impedance between two circuit nodes.
13. A method for making an electronic feedback system product, said method comprising:
forming a first feedback loop for controlling a first operating parameter of the feedback system;
forming a second feedback loop including a plurality of digital control signals to influence the feedback system in a manner which, absent the first feedback loop, would result in a change to the controlled first operating parameter when one or more of the digital control signals change value;
configuring the second feedback loop to affect a larger controlled range of the controlled first operating parameter than the first feedback loop is configured to affect; and
arranging the second feedback loop to influence the feedback system slowly enough, relative to the first feedback loop, to allow the first feedback loop to maintain the controlled first operating parameter without significant perturbation.
14. The method as recited in claim 13 wherein:
the electronic feedback system comprises a phase locked loop; and
the controlled first operating parameter comprises a phase or phasefrequency error of the phase locked loop.
15. The method as recited in claim 13 wherein:
the first feedback loop is responsive to a second operating parameter for controlling the first operating parameter; and
the second feedback loop is also responsive to the second operating parameter.
16. The method as recited in claim 15 wherein:
the second operating parameter comprises a control node voltage.
17. The method as recited in claim 13 wherein:
the electronic feedback system comprises a phase locked ioop having a controlled oscillator; and
the controlled first operating parameter comprises an operating frequency of the controlled oscillator.
18. The method as recited in claim 13 wherein:
the controlled first operating parameter comprises an effective impedance between two circuit nodes.
19. An electronic feedback system comprising:
means for controlling a first operating parameter of the feedback system using a first feedback loop;
means for controlling a plurality of digital control signals of a second feedback loop to influence the feedback system in a manner which, absent the first feedback loop, would result in a change to the controlled first operating parameter when one or more of the digital control signals change value; and
means for influencing the feedback system slowly enough relative to the first feedback loop, upon one or more of the digital control signals of the second feedback loop changing value, to allow the first feedback loop to compensate for the influence of the second feedback loop upon the controlled first operating parameter and thus maintain the controlled first operating parameter without significant perturbation;
wherein the second feedback loop is configured to affect a larger controlled range of the controlled first operating parameter than the first feedback loop is configured to affect.
20. The system as recited in claim 19 wherein:
the electronic feedback system comprises a phase locked loop; and
the controlled first operating parameter comprises a phase or phasefrequency error of the phase locked loop.
21. The system as recited in claim 19 wherein:
the controlled first operating parameter comprises an effective impedance between two circuit nodes.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A prompting apparatus for coupling with a camera for video recording which has an accessory adapter shoe on its top, comprising:
a rectangular cuboid housing with an open front defined by two opposite side walls, a bottom side, a top side, and a rear wall with a round opening for positioning and aligning said camera’s lens;
a flat see-through mirror being placed in said housing with its upper edge being attached to said top side’s rear edge, its lower edge being attached to said bottom side’s front edge, and its two side edges being attached to said two opposite side walls respectively such that said mirror and said housing forming a chamber where said lens is positioned and aligned behind said mirror; and
a mounting and adjusting hardware assembly for coupling said housing with said camera through said accessory adapter shoe;
wherein said top side is covering member which defines a space for placing a tablet device with its screen facing down at an angle of approximately 45 degrees from said mirror and in operation, image on said screen is reflected by said mirror to a speaker’s eyes seeing into said mirror while light from said speaker passes through said mirror into said lens; and
wherein said hardware assembly comprising a vertical adjustment column which is secured to said covering member’s top, an elongate adjustment arm being operatively coupled with said vertical adjustment column to a necessary vertical height and held in place by a fastening means, and an upright bracket with its bottom end being operatively coupled and secured to said accessory adapter shoe and with its top end being operatively coupled with said elongate adjustment arm for adjusting a horizontal distance from said vertical adjustment column to said upright bracket.
2. The prompting apparatus of claim 1, wherein an elastic sleeve is coupled around and between said round opening and said camera to prevent unwanted lights from entering said chamber.
3. The prompting apparatus of claim 1, wherein inner surfaces of said two opposite side walls, said bottom side and said rear wall are coated with anti-reflection materials to prevent unwanted lights from reflecting into said mirror and said lens.
4. The prompting apparatus of claim 1, wherein said vertical adjustment column is secured to said covering member’s top by at least one stud and one thumb screw.
5. The prompting apparatus of claim 1, wherein said fastening means comprises two slots on said vertical adjustment column, each for a thumb screw being operably secured to a female member on one end of said elongate adjustment arm.
6. The prompting apparatus of claim 1, wherein said elongate adjustment arm’s exterior width is slightly narrower than said vertical adjustment column’s interior width such that said elongate adjustment arm can be slid in an inner path of said vertical adjustment column.
7. A prompting apparatus for coupling with a video camera which has an accessory shoe on its top, comprising: a rectangular cuboid housing with an open front defined by two opposite side walls, a bottom side, a top side, and a rear wall with a round opening for positioning and aligning said camera’s lens;
a flat see-through mirror being placed in said housing with its upper edge being attached to said top side’s rear edge, its lower edge being attached to said bottom side’s front edge, and its two side edges being attached to said two opposite side walls respectively such that said mirror and said housing forming a chamber where said lens is positioned and aligned behind said mirror; and
a mounting and adjusting hardware assembly for coupling said housing with said camera through said accessory shoe;
wherein said top side is a covering member which defines a space fitting for holding a tablet device with its display screen facing down at an angle of approximately 45 degrees from said mirror and in operation, image on said screen is reflected by said mirror to a speaker’s eyes seeing into said mirror while light from said speaker passes through said mirror into said lens;
wherein an elastic sleeve is coupled around and between said round opening and said camera to prevent unwanted lights from entering said chamber;
wherein inner surfaces of said two opposite side walls, said bottom side and said rear wall are coated with an anti-reflection layer to prevent unwanted lights from reflecting into said mirror and said lens;
wherein said hardware assembly comprising a vertical adjustment column, an elongate adjustment arm which is secured to said vertical adjustment column at a necessary vertical height and held in place by at least one fastener, and an upright mounting bracket having a flat rectangular base which is to be operatively inserted into said accessory shoe and secured by one thumb screw, said upright mounting bracket’s upper end being slideably coupled with said elongate adjustment arm along an elongate slot on said elongate adjustment arm’s elongation direction for adjusting a horizontal distance from said vertical adjustment column to said upright mounting bracket.